1 files changed, 8 insertions, 0 deletions
diff --git a/lambda-calcul/rust/src/lambda.rs b/lambda-calcul/rust/src/lambda.rs
index 1a1a85b..ea571fd 100644
--- a/lambda-calcul/rust/src/lambda.rs
+++ b/lambda-calcul/rust/src/lambda.rs
@@ -247,6 +247,14 @@ mod lambda_test {
     }
 
     #[test]
+    fn evaluate_symbol_starting_with_x_returns_same_symbol() {
+        let sym= "x1xYgddw7";
+
+        let value = parse1(sym);
+        assert_eq!(value, eval1(&value));
+    }
+
+    #[test]
     fn evaluating_a_non_reducible_value_yields_itself() {
         let value = parse1("(foo 12)");
         assert_eq!(value, eval1(&value));